You can and should start soliciting feedback even before you commit to building a product. The first goal is finding a problem(s) worth solving, then determining the fastest/smallest way to solve it.
The best way to do both is through face-to-face customer interviews aka customer discovery. A lot has been written about this process by Steve Blank and I took a stab at outlining what worked for me on my blog and my book: Running Lean.
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